Tool guide for dentists&#39; contraangles



Jan. 16, 1934. c. E. HARTMAN TOOL GUIDE FOR DENTISTS CONTRA-ANGLES Filed July 10, 1931 Patented Jan. 16, 1934 1,9435% TOOL GUIDE FOR, DENTISTS CONTRA- ANGLES Carl Eugene Hartman, Denver, Colo. Application July 10, 1931. Serial No. 549,834

6 Claims. (01. 32-10) My invention relates to dental cutting tools Figure 1 is an enlarged view of a dentists and more especially to a tool guide for a dental contra-angle, a tool mounted therein, and my contra-angle, or tool holder. tool guide mounted upon the contra-angle hub.

When a plate or bridge is to be anchored upon Figure 2 is a view looking down upon Figure 1.

.5 a tooth, one construction which may be used is Figure 3 is a view looking at Figure 1 in the 60 what is known as a Carmichael; that is, the direction of the arrow but with the tool, and tooth to be used as the anchor tooth must have the handle of the contra-angle removed, and one or more grooves cut in it in order to properly the guide piece being detached from and apand securely mount the plate or bridge conpearing directly above the swivel base upon nection. which it is normally mounted. 65

In cutting this groove a drill, emery wheel or Figure 4 is a view looking down upon a modiother cutting tool is mounted in a proper tool fied form of guide piece. holder, generally in what is called a contra- Figure 5 is a side elevation of Figure 4. angle. Figure 6 is a view of my guide upon a contra- In the work of cutting this groove, which angle equipped with a'tool, indicating just how 79 should be accurately done if the work is to be it would be used in cutting a groove in a tooth. high class, it is diflicult for the dentist to steady The contra-angle l is provided with theusual the cutting tool so that the groove will be cut of tool latch 2, which holds the tool 3 in place. the proper proportions and alignment, and it is Any other tool locking means may be employed also difficult to prevent the tool from now and so long as it acts to look the tool in the tool 75 then slipping oil the tooth with the chance of holder. injuring thegums of the patient or of at least The contra-angle is also provided with the causing some pain or discomfort. handle 4, the hub 5, and the hub nut 6. Any

It is therefore the object of this invention to other tool holder than a contra-angle may be I provide a tool guide for use with the contraused to mount my tool guide so long as it is 8 angle or other tool holder, in cutting the mountprovided with a hub upon which the swivel base ings grooves in teeth used as anchors. '7 of my guide may be properly mounted.

A further object of this invention is to pro- The swivel base 7 has an aperture to receive vide such a tool guide for use with the contrathe hub 5 of the contra-angle, the nut fi'being angle or other tool holder, which may be easily screwed in place after the swivel base is mounted 85 and quickly attached to and detached from the thereon and acts to hold the swivel base on the tool holder. hub while still permitting it to rotate thereon.

. A further object is to provide such a tool The swivel base 7 has the tongue 8, through guide for use with a contra-angle or other tool which is threaded the locking screw 9. When holder, which may be quickly and easily adjusted it is desired to hold the swivel base in one posi 9 to fit any size and conformation of tooth, and tion on the contra-angle, thus locking the swivel the adjustment locked as set. base in the position set, the screw 9 is screwed A further object is to provide a tool guide for inward against t c ntra-ang1e a dental 13001 holder, Which at the Option of the The guide piece 10 is provided with the curved dentist may either be left to swivel freely about guide rib 11 which is adapted to bear against axls tool or may b swlveled to any the tooth in which the groove is being cut by the desired position about the axis of the tool and tool 3 g q k m Any other proper tool besides the drill 3 shown 1s invention the above obJects are accomb used at th 0 tion of the dentist 5515 plished by providing a swivel base adapted to fit may 6 and. swivel upon the hub of a contra-angle or The guide. plece Is also provlded Wlm the tool holder and to be held thereon by the usual 'Q 12 Into Whlch t ongues 13 of t hub nut the base also being provided with a, swivel base 7 have a close sliding fit. The guide locking screw to lock it upon the hub in an piece 10 is also provided with the locking screws E550 swivel position, and by providing a guide piece slidably mounted upon the swivel base, and h guide piece 0 m y be m v alone they having screws to lock it in place at any point tongues 13 of the swivel base '7 to the position of its slide along said base. where the rib 11 will make the proper support This will all be fully described hereinafter and guide for the tool 3 by contact with the tooth 1 5 and illustrated in the drawing, in which; as shown at 15, in Figure 6. The guide piece 10 1.1

may then be locked in the position set by the locking screws 14.

When the groove is finished at the point for which the guide has been set, a new setting of the guide may be made to guide the tool while another part of the groove is being out.

As can be seen in Figure 6, the guide setting will have to be changed probably several times as the groove approaches the gums and the groove indicated is finished.

That is, since the tooth as shown is thicker near the gums, the guide will have to be set farther from the tool as the tool approaches the gums so that the groove will be cut straight.

Whether the swivel base '7 will be left free to swivel on the hub 5 or be locked in one position by the locking screw 9 will depend upon the nature of the tooth and the size, nature, position and direction of the groove the dentist desires to make in the tooth, as well as depending upon the individual taste and judgment of the dentist.

In the modified form of guide ribs shown at 11 in Figures 4 and 5 the rib 11' is covered by the covering 16 which may be made of rubber or some other non-metallic material, which is adapted to rest against the patients gums and thereby support and guide the tool. The height of the rib 11 from the swivel base '7 is made enough greater for this purpose.

For some work, and for some teeth, some dentists may prefer the guide upon the gums; but in any case the general result is the same in "that the device acts to guide the tool so that accurate, convenient, certain and comfortable cutting of grooves is possible. Naturally, if desired, the guide piece may be slid upon the tongues or guides of the swivel base so that the rib will then bear upon the other side of the tooth as indicated by the dotted line position shown in Figure 6; that is, the guide piece may be moved along till the outside of the curve of the rib bears against the other side of the tooth.

It will thus be seen that by swiveling the swivel base upon the hub 5, or by sliding the guide piece along the tongues or guides of the swivel base, a dentist will be able to adjust the guide to conveniently and comfortably and steadily guide the tool 3 for substantially any work at all that is required to be done, whichever form of guide rib is employed.

Having now described my invention, what I claim as new, and desire to protect by Letters Patent, is as follows 1. In a tool guide for a dental cutting tool held in a tool holder, an elongated, yoke-shaped guide having its guide surface extending at right angles to the tool and adapted to be carried by the tool holder and to contact and slide along the tooth being worked upon by the tool and thereby guide said tool, and means mounting the said guide upon the tool holder and spacing it from the adjacent side of the said tool.

2. In a tool guide for a dental cutting tool held in a tool holder, a guide having a horizontally elongated sliding contact surface ex; tending at right angles to the tool and facing said tool and adapted to be carried by the tool holder and to contact and slide along the tooth being worked upon by the tool and thereby guide said tool, a nut concentric with said tool and means held to said tool holder by said nut and mounting the said guide upon the tool holder spaced from the adjacent side of said tool.

3. In a tool guide for a dental cutting tool held in a tool holder, a hub having parallel guide tongues mounted upon the tool holder concentric with the tool, a nut concentric with said tool securing the hub to the tool holder, a guide extending at right angles to the tool and adapted to contact and slide along the tooth being worked upon by the tool and thereby guide said tool and means mounting the guide to slide along the tongues of said hub whereby the spacing of the guide from said tool may be varied.

4. In a tool guide for a dental cutting tool held in a tool holder, a hub having parallel tongues swiveled upon the tool holder concentrio with the tool, means to secure the hub upon the tool holder, means to lock the hub and pre- 105 vent its swiveling upon the tool holder, a guide extending at right angles to the tool and adapted to contact and slide along the tooth being worked upon by the tool and thereby guide said tool, means slidably mounting the guide upon the tongues of said hub and means to lock they said guide with respect to said hub whereby its radial position from said tool may be set. A

5. In a tool guide for a dental cutting tool held in a tool holder, a guide having a horizontally elongated sliding contact surface extending at right angles to the tool and facing said tool and adapted to contact and slide along the tooth being worked upon by the tool and thereby guide said tool and means mounting the said guide upon said tool holder laterally spaced fromsaid tool. a

6. In a tool guide for a dental cutting tool held in a tool holder, a guide having a horizontally elongated sliding contact surface extending at right angles to the tool and facing the tool, and adapted to be carried by the tool holder and thereby guide said tool, and means mounting the said guide upon the tool holder and spacing it from the adjacent side of the tool sufficient'to permit part of a tooth to be intermediatethe sliding contact guide and the tool.

CARL EUGENE I-IARTMAN. 

